Finisar AN-2030 specifications Alarm and Warning Flags, Los

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AN-2030: Digital Diagnostic Monitoring Interface for Optical Transceivers

F i n i s a r

 

 

 

 

 

 

 

110

1

LOS

Digital state of the LOS Output Pin. Updated within 100msec

 

 

 

 

 

of change on pin. This function is implemented in all Finisar

 

 

 

 

 

transceivers with digital diagnostic capability.

 

 

110

0

Data_Ready_Bar

Indicates transceiver has achieved power up and data is

 

 

 

 

 

ready. Bit remains high until data is ready to be read at

 

 

 

 

 

which time the device sets the bit low. This function is

 

 

 

 

 

implemented in all Finisar transceivers with digital diagnostic

 

 

 

 

 

capability.

 

 

 

111

7-0

Reserved

Reserved.

 

 

The data_ready_bar bit is high during module power up and prior to the first valid A/D reading. Once the first valid A/D reading occurs, the bit is set lo w until the device is powered down. The bit must be set low within 1 second of power up.

Alarm and Warning Flags

Bytes 112 – 119 contain a set of non – latched alarm and warning flags. It is recommended that detection of an asserted flag bit be verified by a second read of the flag at least 100msec later. For users who do not wish to set their own threshold values or read the values in locations 0 - 55, the flags alone can be monitored. Two flag types are defined.

1)Alarm flags associated with transceiver temperature, supply voltage, TX bias current, TX output power and received optical power as well as reserved locations for future flags. Alarm flags indicate conditions likely to be associated with an in- operational link and cause for immediate action. Please consult the appropriate Finisar specification sheet for thresholds associated with a particular module.

2)Warning flags associated with transceiver temperature, supply voltage, TX bias current, TX output power and received optical power as well as reserved locations for future flags. Warning flags indicate conditions outside the normally guaranteed bounds but not necessarily causes of immediate link failures. Certain warning flags may also be defined by the manufacturer as end-of-life indicators (such as for higher than expected bias currents in a constant power control loop). Please consult the appropriate Finisar specification sheet for thresholds associated with a particular module.

9/26/02 Revision D

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Contents 35 2. Applicable Documents Scope and OverviewEnhanced Digital Diagnostic Interface Definition Overview Specific Data Field Descriptions Password Entry 8 bytesCal Constants Bytes Control Functions 8 bytesData Serial ID Data Fields Address A0Name Bytes Description of Field Address Identifier ConnectorIdentifier values Extended IdentifierDescription of connector Connector valuesTransceiver codes TransceiverEncoding 4a Sonet Reach SpecifiersSpeed Reach Specifier bit Description Code Description of encoding mechanismLength 9μ-km BR, nominalLength 9μ Length 50μVendor name Length CopperDwdm Channel Spacing Vendor OUILaser Wavelength Vendor RevDwdm Wavelength Fraction Option values OptionsBR, max 13 BR, minDate Code Diagnostic Monitoring TypeData Description of field Address N i s a r Enhanced Options SFF-8472 Compliance 10 I/O Timing for Soft Control & Status Functions11 SFF-8472 Compliance Diagnostics 13 Digital temperature format Temperature 12 Bit weights C for temperature reporting registersN i s a r 14 Alarm and Warning Thresholds 2-Wire Address A2h Alarm and Warning ThresholdsN i s a r 16b Format for offsets 16a Unsigned fixed-point binary format for slopes16d Example of Floating Point Representation 16c IEEE-754 Single-Precision Floating Point Number FormatBit Name Description LOS Alarm and Warning Flags18 Alarm and Warning Flag Bits 2-Wire Address A2h 20 User Eeprom 2-Wire Address A2h 19 Password Addresses 2-Wire Address A2hByte Bit Name Description Address # Bytes Name DescriptionDdtc Electrical Interface Definition Overview Wire Interface OperationN i s a r Current Address Read Detailed 2 -Wire Serial Port Operation N i s a r Wire Protocol Data Transfer Protocol Vcc = 3.15V to DC Electrical CharacteristicsFor More Information
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